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tan^-1 x + tan^-1y= tan^-1 (frac{x+y}{1-...

`tan^-1 x + tan^-1y= tan^-1 (frac{x+y}{1-xy}`).

A

all x, y `in` R

B

|x|, gt 1, |y|, lt1

C

|x| gt 1, |y| gt 1

D

xy gt -1

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